Removing elements from Koni-Omega lenses

I tried removing the front element from my Koni 90mm lens but after I removed the hood I assumed the the front would just unscrew but it wouldn't budge and didn't want to force it too muck. I was going to put some lighter fluid around it but I figured someone here would know exactly how to remove it. I have a 90mm and the 135mm with a little haze.

When you say front element do you mean front cell -- everything in front of or behind the shutter -- or do you mean the outermost piece of glass in the front cell?

If you mean front cell, I've removed both cells from a 60/5.6 and two (!) 58/5.6 lenses for the KO system. They all unscrewed. If you mean front cell, try using a strap wrench.

If you remove just the glass element (not the threaded front cell) you are likely to do more harm than good. To properly re-align the glass element you'll need a centering tool that will cost more than the lens.

I do mean the front group but I also want to cleans the individual cells also.

The 90mm f/3.5? It’s a Tessar. No need to recenter with a special tool.

If it required that precision, it would be the most expensive consumer photography Tessar in the world (branding markup aside), as it would have been actively centered and bonded in place. But, being a Tessar, that’s just not the case. I would love to design optics with the sloppiness of a Tessar.

Optics held in by retainers and machine tolerances have loose enough tolerances to be assembled and controlled by retainers and machine tolerances.

I would avoid the light fluid. Removing the front lens group is pretty straightforward, it just unscrews. I use a 47mm flexiclamp wrench.